4. That's probably why you haven't met anyone.

If you are in a conversation where this is even remotely relevant, it is still not the ideal time to say this. If someone is talking about something insane they are doing ("I set the record for most lap dances at the club last week!"), then they are likely not looking for commentary on what they are missing out on in life. It may be true, but only a complete sh*t-disturber would point this out.